[openstack-dev] Jenkins test logs and their retention period

Clark Boylan clark.boylan at gmail.com
Fri Mar 21 23:23:39 UTC 2014

Hello everyone,

Back at the Portland summit the Infra team committed to archiving six months
of test logs for Openstack. Since then we have managed to do just that.
However, more recently we have seen the growth rate on those logs continue
to grow beyond what is a currently sustainable level.

For reasons, we currently store logs on a filesystem backed by cinder
volumes. Rackspace limits the size and number of volumes attached to a
single host meaning the upper bound on the log archive filesystem is ~12TB
and we are almost there. You can see real numbers and pretty graphs on our
cacti server [0].

Long term we are trying to move to putting all of the logs in swift, but it
turns out there are some use case issues we need to sort out around that
before we can do so (but this is being worked on so should happen). Until
that day arrives we need to work on logging more smartly, and if we can't do
that we will have to reduce the log retention period.

So what can you do? Well it appears that our log files may need a diet. I
have listed the worst offenders below (after a small sampling, there may be
more) and it would be great if we could go through those with a comb and
figure out if we are logging actually useful data. The great thing about
doing this is it will make lives better for deployers of Openstack too.

Some initial checking indicates a lot of this noise may be related to
ceilometer. It looks like it is logging AMQP stuff frequently and inflating
the logs of individual services as it polls them.

Offending files from tempest tests:
screen-n-cond.txt.gz 7.3M
screen-ceilometer-collector.txt.gz 6.0M
screen-n-api.txt.gz 3.7M
screen-n-cpu.txt.gz 3.6M
tempest.txt.gz 2.7M
screen-ceilometer-anotification.txt.gz 1.9M
subunit_log.txt.gz 1.5M
screen-g-api.txt.gz 1.4M
screen-ceilometer-acentral.txt.gz 1.4M
screen-n-net.txt.gz 1.4M
from: http://logs.openstack.org/52/81252/2/gate/gate-tempest-dsvm-full/488bc4e/logs/?C=S;O=D

Unittest offenders:
Nova subunit_log.txt.gz 14M
Neutron subunit_log.txt.gz 7.8M
Keystone subunit_log.txt.gz 4.8M

Note all of the above files are compressed with gzip -9 and the filesizes
above reflect compressed file sizes.

Debug logs are important to you guys when dealing with Jenkins results. We
want your feedback on how we can make this better for everyone.

[0] http://cacti.openstack.org/cacti/graph.php?action=view&local_graph_id=717&rra_id=all

Thank you,
Clark Boylan

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